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I have an A record pointing to my IP, a reverse record pointing to my domain name and the server's hosts and hostname have been configured, all this is done previously to the install and the server been rebooted just in case.

Please don't pay attention to this issue. In the end of installation control panel generates special domain name lake lee30e0a.justinstalledpanel.com for providing free SSL certificate.

After domain name lee30e0a.justinstalledpanel.com is generated, system point A record of domain to server IP address. Then check it. As I can see your server use NAT and don't have public IP address on the server network interface.